An amateur treasure hunter prowling English farmland with a metal detector stumbled upon the largest Anglo-Saxon treasure ever found, a massive seventh-century hoard of gold and silver, sword decorations, crosses and other items, British archaeologists said Thursday.

The goal of coal mining is to remove coal from the ground. Coal is valued for its energy content, and since the 1880s has been widely used to generate electricity. But sometimes coal mining can go terribly wrong, as this video depicts.

Odyssey Marine Exploration says it is examining more than half-a-million coins from the shipwreck as part of a find that could net it around half a billion dollars. The bounty has sparked public interest in the controversial business of treasure hunting by Odyssey Marine Exploration.